Logseq in brief
Logseq began in 2020 as an open-source project and grew into one of the best-known privacy-first alternatives to Roam Research and Obsidian. Its GitHub repository has more than 45,000 stars, and its code is licensed under the AGPL. A small core team, about four people according to its forum, builds the app with community contributors, and it is funded partly through Open Collective sponsorships. Logseq attracts students, academics, writers, researchers and software developers who think in outlines and want notes that link together without handing their data to a cloud service. It runs on Windows, Mac, Linux, iOS, Android and the web.
Everything in Logseq is a block in an outline. You write in a daily journal by default, then link ideas with [[page]] references or #tags, and backlinks show where every page is mentioned. Blocks can be embedded or referenced elsewhere, so one idea can appear in many contexts. Built-in features include tasks with TODO and NOW states and scheduled dates, queries that pull blocks matching conditions, a graph view, whiteboards for spatial thinking, flashcards with spaced repetition and PDF annotation that links highlights back into notes. The original version stores pages as Markdown or Org-mode files in a folder you choose, so other tools can read them.
Logseq's strengths are its open-source license, local-first storage, powerful block references and queries, built-in journals, flashcards and PDF annotation, and a path to AI through MCP and plugins. Its weaknesses are a long transition to the DB version, beta-quality features, a slower release pace than commercial apps and a learning curve for queries. Obsidian has a larger plugin library and file-based notes, but is not open source. Roam Research pioneered the block outliner as a paid service. Tana and Capacities add structured objects and built-in AI. Notion suits team wikis. Choose Logseq if you want a free, open-source outliner that keeps notes on your own device.